But if you find Phuket a little too crowded in the peak tourist season, then Samui Island of Surat Thani (644 km) will be another choice. Its tranquillity and unpolluted environment will refresh you. Pha-ngan Island, which is a famous diving centre, is also an interesting destination. Ranong (568 km), Thailand's rainiest province, is well known for its hot mineral springs. Visitors can enjoy mineral bath in many hotels here. The offshore Surin Island is stunning with abundant coral reefs and colourful fishes.